<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h2>当前计数：{{counter}}</h2>
    <button v-on:click="add">+</button>
    <button v-on:click="sub">-</button>
<!--    下面是语法糖写法-->
<!--    <button @click="sub">-</button>-->
</div>
<script src="js/vue.js"></script>
<script>
    const app = new Vue({
        el:"#app",
        data:{
            counter:0
        },
        methods:{
            add:function (){
                this.counter++
            },
            sub:function (){
                this.counter--
            }
        }
    })
</script>
</body>
</html>